Problems after a damaged hose

This topic contains 9 replies and was last updated by brian123c 8 years 10 months ago
Author
brian123c
February 26th, 2013 8:27pm
Post
Hi guys, just joined after a search on the internet. I bought a mini digger a year ago and its been great with no problems other than a new battery. Thats the good bit, I gave my neighbour a lone of it and he damaged a hydrolic hose which he changed, I have put in 16 liters of fluid but the arm can lift right up to the max and down but the other control is very slow its almost like slow motion.When the arm is up at the max it drops very slowly on its own which it did not do before. The hydrolic fliud if full and its not leaking does it need bled, im a bit of a novice when it comes to mechanics. The digger says MX 15 SMC

its a 1999 model. I live in France and the local repair company says it does not know the model so they do not want to work on it. Any ideas.
jim-owen
February 27th, 2013 12:55am
Welcome to Mechanics Hub. It is always a good thing to see that people are still looking for and finding this site.

One thought that comes to mind for your problem: was the replacement hose and the fittings on on the hose both the right size. If the holes are too small, they will act like orifices, restricting flow. Hoses should be marked with their sizes but not necessarily the fittings.



If you suspect that it may be the problem, to check the fittings out, make sure that the system is fully de-pressurized, remove from their fittings and compare the ends to the opposite companion hose.



Other things that may have happened: dirt or other contaminants were introduced when the hose was changed. Also, the hose maker may not have cleaned the hose internally allowing rubber or ?? blocking a valve.



Hope you find your problem.
joseph-toth
February 27th, 2013 10:49am
"If you suspect that it may be the problem, to check the fittings out, make sure that the system is fully de-pressurized, remove from their fittings and compare the ends to the opposite companion hose.



Other things that may have happened: dirt or other contaminants were introduced when the hose was changed. Also, the hose maker may not have cleaned the hose internally allowing rubber or ?? blocking a valve".
from Jim

I am in full agreement, as a plus my recomandation is to flush all hydraulic system. Dirt could move in time and affect something else. Hard work...
brian123c
February 27th, 2013 5:32pm
Thanks for the advice, I had a quick look about and ended up hunting out a workshop who would have a look at it. They had a quick look and said to come back in 15 days. They had it going in all angles but the arm was just limp, will let you know what the fault was.

thanks
will-tilley
March 16th, 2013 12:15am
It may be the replacement hose,I have seen guys crimp the ends too tight and bar off the line completely.Hope you find your problem.
daylon-mosley
March 21st, 2013 5:55am
Where was the hose located on the machine?

You say you lift the arm all the way out and it drops slowly? Does it drop suddenly when you go to lift the arm back up, or without touching any controls?

What is the other control that is slow?

What brand and model is your machine?



Pull the hose off, take a peak inside sometimes if the hose wasn't cleaned out properly you could get a flap inside the restricts flow, which would create a pressure increase and cause oil to go over your main relief. But as for the arm dropping suddenly would have no effect on that. If that is a completely new symptom after the hose was changed contaminants could have got caught up in your load check located in your main valve block for your arm circuit.



I would advise on an oil sample, and/or cut open your oil filter and inspect.
peter-pl
April 17th, 2013 8:47pm


Will Tilley wrote:

It may be the replacement hose,I have seen guys crimp the ends too tight and bar off the line completely.Hope you find your problem.


Check this as I've seen hundreds overcrimps done by "new" guys making hoses :S
rodel-marata
April 20th, 2013 12:03pm
check for termperatures, uncoomon sounds or vibration!! if its going down on its own !! !! thier should be an internal leaking somewhere in ur system !! and it goes together with hot temperature !! if its a cylinder try to feel the cylinder !! if thier is any hizzing sound inside !! during replacing the hose dirt goes in !! and damage seals to cause leaking !! if thier is air it should be moving erratically !! but although try to airbleed it !! just be careful !! airbleeding is a dangerous work !! cause ur releasing a fluid pressure sharp enough to chop ur hand !! especially classic load sensing systems !
rodel-marata
April 20th, 2013 12:04pm
check for termperatures, uncoomon sounds or vibration!! if its going down on its own !! !! thier should be an internal leaking somewhere in ur system !! and it goes together with hot temperature !! if its a cylinder try to feel the cylinder !! if thier is any hizzing sound inside !! during replacing the hose dirt goes in !! and damage seals to cause leaking !! if thier is air it should be moving erratically !! but although try to airbleed it !! just be careful !! airbleeding is a dangerous work !! cause ur releasing a fluid pressure sharp enough to chop ur hand !! especially classic load sensing systems !
brian123c
April 20th, 2013 5:37pm
Thanks for all the help, it was water in the hydrolics the hose that was damaged was low down on the digger so I guess that's how it got in. Its back and working fine now, other than it can run all day without the slightest hitch, then on other days it sounds like its hunting for fuel and cuts out. Leave it for a couple of hours and its as good as new again.

Its had all the filters changed and bled and its not overheating. It has always been a great starter could it be anything to do with them steam cleaning the engine before they started work. Other than that the weather is good in this part of France.

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